This is what I found
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Bentley S3 Continental, #BC38XC
The last car was not bodied by H.J. Mulliner but in conjunction with F.L.M. Panelcraft, it was a 1964 Bentley S3 Continental, #BC38XC.
From the photos of this car it becomes clear beyond doubt that an existing H.J. Mulliner, Park Ward Fixed Head Coupé body to "Koren-Design" (sometimes described as "Chinese Headlamps") had been subject to major alterations.
A large perspex sunroof had been fitted, though a fixed one with no opening mechanism. The front of the car was almost unaltered with the exception of overriders to Harold Radford design, i.e. with rubber insets at the top. The rear however was with minimal overhang and surprised with a fastback design of rear light and tailgate whereas the rear wings were styled almost like fins.